Most studies directed at simulating an urban climate have been based on the consideration that an urban canopy layr can be assumed roughness, and therefore, obtaining a suitable heat balance for an urban canopy layr has been difficult. This problem led to my thesis, which is focused on investigating all urban surfaces using a new index that can evaluate an urban thermal environment during urban development planning. The effects of employing the index are verified using remote sensing and GIS data to investigate the actual conditions of all urban surfaces. In addition, a heat balance algorithm is developed which can simulate these surfaces such that urban thermal images can be constructed.1)A new index based on sensible heat flux, called "heat island potential(HIP)", was defined to express the thermal characteristics of each type of region contained in an urban area, i.c., spatial forms and materials. The optimum mesh scale required to set up an system of particles used to perform the h
… Moreeat balance simulation was found to be 1 m.2)A practical, computer-performance-based method was developed for predicting the surface temperature distributions of all urban surfaces. On the assumption that the surface temperature distributions of surroundings is equal to air temperature, the heat balance of each particle system was simulated. Based on results providing the temperature distribution of all urban surfaces, the long wave radiation from the surroundings was simulated such that the heat balance of each particle system could be simulated again, with this feedback system being optivized after two iterations. The effectiveness of the algorithm developed based on GIS data was verified by comparing calculated results with actual surface temperature distributions observed by remote sensing.(1)周辺地物を気温と等しいと仮定して各質点における第一次熱収支シミュレーションを行い、表面温度の近似値の分布を求める。(2)得られた結果をもとに周辺地物からの長波長放射量を求め、再度全質点の熱収支シミュレーションを行う。(3)以上をくり返して、都市の全地表面の表面温度分布の計算結果を収束させる。GISデータを用いて実際の地区における熱収支計算を行い、都市の時系列の熱画像を作成した。シミュレーション結果と、航空機MSSによる表面放射温度分布とを比較検討することにより、本シミュレーション手法の妥当性を示した。 Less